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Numéro de publicationUS7149188 B2
Type de publicationOctroi
Numéro de demandeUS 09/771,225
Date de publication12 déc. 2006
Date de dépôt26 janv. 2001
Date de priorité26 janv. 2000
État de paiement des fraisCaduc
Autre référence de publicationUS20020056132, WO2001056309A1
Numéro de publication09771225, 771225, US 7149188 B2, US 7149188B2, US-B2-7149188, US7149188 B2, US7149188B2
InventeursEric K. Wilson
Cessionnaire d'origineVyyo, Inc.
Exporter la citationBiBTeX, EndNote, RefMan
Liens externes: USPTO, Cession USPTO, Espacenet
Distributed processing for optimal QOS in a broadband access system
US 7149188 B2
Résumé
A method for distributing the QOS processing in a broadband access system to the system modems and the head-end equipment. Requests for a change in the operating parameters are transmitted on an exception basis, thereby greatly reducing the amount of system over-head required. In the upstream, the Cable Modem Termination System (CMTS) or Wireless Modem Termination System (WMTS or Wireless Hub) determines a signal-to-noise ratio (SNR) or Bit Error Rate (BER) (or similar measurable parameter) quality data for each received packet. If a measured parameter is outside of the predetermined limits, then the WMTS reports to the NMS (Network Management Operating System) the modem ID and the measured data of the particular packet. The NMS may then modify the operating parameters. In the downstream, each modem determines an SNR or BER (or some other measurable parameter) measurement for the incoming packets. These values may be compared to some boundary conditions. If the system is performing outside the boundary conditions, the modem sends an exception message to the NMS which reassigns the modem to a different downstream channel or modifies the channel parameters.
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Revendications(24)
1. A method for distributed upstream quality of service (QOS) processing in a broadband access system, the method comprising:
measuring a quality of received packets sent by a modem in an upstream channel at an upstream modem termination system;
determining whether the measured quality is within a predetermined range;
reporting an out-of-range quality for the received packets to a network management server; and
modifying operating parameters for the upstream channel in accordance with the measured quality, if an out-of-range quality is reported;
wherein the out-of-range quality reported includes a measured quality above a high quality threshold and is reported at a different priority than measured qualities below a low quality threshold.
2. The method of claim 1, wherein measuring a quality of received packets comprises measuring a signal-to-noise ratio (SNR).
3. The method of claim 1, wherein measuring a quality of received packets comprises measuring a bit error rate (BER).
4. The method of claim 1, wherein measuring a quality of received packets comprises measuring a Forward Error Correction (FEC) quality measure.
5. The method of claim 1, wherein if the quality measure is below a predetermined lower limit for some averaged or weighted averaged value for a series of packets, then the modem ID and the measured quality data of a particular packet or average is reported to the network management server.
6. The method of claim 5, wherein the network management server reassigns the modem to a different downstream channel in the same or overlapping sector, which has a different operating frequency.
7. The method of claim 5, wherein the network management server reassigns the modem to a lower order modulation type.
8. The method of claim 5, wherein the network management server reassigns the modem to a lower symbol rate.
9. The method of claim 5, wherein the network management server reassigns the modem to a more robust Forward Error Correction scheme.
10. The method of claim 5, wherein the network management server reassigns the modem to a combination of a different frequency, a lower order modulation type, a lower symbol rate, and a more robust Forward Error Correction scheme.
11. The method of claim 1, wherein if the quality measure is above a predetermined upper limit for some averaged or weighted averaged value for a series of packets, then the modem ID and the measured quality data of a particular packet or average is reported to the network management server.
12. The method of claim 11, wherein the network management server reassigns the modem to a channel with a higher order modulation.
13. The method of claim 11, wherein the network management server reassigns the modem to a different type of modulation.
14. The method of claim 11, wherein the network management server reassigns the modem to a faster symbol rate.
15. The method of claim 11, wherein the network management server reassigns the modem to a lower Forward Error Correction scheme.
16. The method of claim 11, wherein the network management server reassigns the modem to a channel which has similar parameters but less traffic.
17. A method, for distributed downstream quality of service (QOS) processing in a broadband access system, the method comprising:
measuring a quality of received packets in a downstream channel at a modem;
comparing the measured quality with predetermined boundary conditions;
determining whether the measured quality is within the predetermined boundary conditions;
sending an exception to a network management server, if the measured quality is outside the boundary conditions; and
modifying operating parameters for the downstream channel in accordance with the measured quality;
wherein if the measured quality is below a lower boundary condition, the exception is sent with a high priority, and if the measured quality is above a high boundary condition, the exception is sent with a lower priority.
18. The method of claim 17, wherein if the measured quality is below a lower limit, the network management server reassign the modem to a different downstream channel.
19. The method of claim 17, wherein if the measured quality exceeds an upper limit, then the modem sends an exception signal offering to move to a less utilized channel.
20. The method of claim 17, wherein if the measured quality exceeds an upper limit, then the modem sends an exception signal offering to move to a channel with a higher net data rate.
21. The method according to claim 17, wherein the method is performed in a broadband wireless access system.
22. A method for distributed processing for optimal quality of service (QOS) in a broadband access system, the method comprising:
a method for distributed upstream quality of service (QOS) processing, the method comprising:
measuring a quality of received packets sent by a modem in an upstream channel at an upstream modem termination system;
determining whether the measured quality is within a predetermined range;
reporting an out-of-range quality for the received packets to a network management server; and
modifying operating parameters for the upstream channel in accordance with the measured quality, if an out-of-range quality is reported; and
a method for distributed downstream quality of service (QOS) processing, the method comprising:
measuring a quality of received packets in a downstream channel at a modem;
comparing the measured quality with predetermined boundary conditions;
determining whether the measured quality is within the predetermined boundary conditions;
sending an exception to a network management server, if the measured quality is outside the boundary conditions; and
modifying operating parameters for the downstream channel in accordance with the measured quality;
wherein:
the exception is sent,
at a first priority if the measured quality is below and outside the boundary conditions, and
at a second priority if the measured quality is above and outside the boundary conditions; and
the first priority is higher than the second priority.
23. The method according to claim 22, wherein the method is performed in a broadband wireless access system.
24. The method according to claim 1, wherein the method is performed in a broadband wireless access system.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority from U.S. Provisional Patent Application entitled DISTRIBUTED PROCESSING FOR OPTIMAL QOS IN A BROADBAND ACCESS SYSTEM, filed Jan. 26, 2000, Application Ser. No. 60/178,030; this application is related to the co-pending and commonly assigned U.S. Patent Application entitled GRAPHICAL INTERFACE FOR MANAGEMENT OF A BROADBAND ACCESS NETWORK, filed Jan. 26, 2001, Application Ser. No. 09/771,017; the entirety of both applications are herein incorporated by reference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates generally to the field of data communications, and more particularly to a method and apparatus for distributed processing for optimal quality of service (QOS) in a broadband access system.

2. Description of the Related Art

In broadband access systems such as cable modem systems, particularly wireless ones, the overall system environment is dynamic. For example, modems may come-on-line or drop-off as users log-on or log-off the system. Furthermore, extensions and taps may be added to the CATV cable system. In wireless systems, multi-path and fading cause changes in the operating environment, as do changes in temperature and even the time of year. Also, various other conditions are outside the control of the system operator. In addition, system capabilities may be added and dropped from the base station at any time.

All of these system variations require a system operator to constantly monitor and update the system parameters, in order to provide for optimal operational efficiency and data throughput. Since this is a complex and highly interactive process, system changes are generally done infrequently. In fact, most system operators currently set a minimum data rate in a channel to prevent any problems under the worse possible conditions. This results in poorer data rates than might otherwise be possible. For example, many wireless systems are capable of operating at 64 QAM with a 5 megasymbol rate, but this operating environment requires a very good signal-to-noise ratio (SNR), and virtually no multi-path. Thus, in practice, system operators set the operating conditions to 16 QAM or QPSK, or to a slower symbol rate, in order to ensure the system will function even under various anomalous conditions. This results in a less than optimal system operating condition.

System performance could be improved if the system parameters were frequently adjusted to take advantage of the changing conditions. The process of monitoring an access system could be automated, but an automatic system would require a large and complex operating algorithm to determine what changes could be made, and how best to make those changes for each modem in the system. This process becomes exponentially more difficult as more modems are added on-line. Polling the modems for the quality of their received downstream signal also increases the traffic on the network and thereby reduces the net data throughput.

Thus, it would be desirable to be able to control the quality of service in a broadband access system, without requiring the manual adjustment of the system operational parameters and without significantly increasing the system over-head.

SUMMARY OF THE INVENTION

In general, the present invention distributes the QOS processing to the system modems and the head-end equipment. Requests for a change in the operating parameters are transmitted on an exception basis, thereby greatly reducing the amount of system over-head required. In the upstream, the Cable Modem Termination System (CMTS) or Wireless Modem Termination System (WMTS or Wireless Hub) determines a signal-to-noise ratio (SNR) or Bit Error Rate (BER) (or similar measurable parameter) quality data for each received packet.

If a measured parameter is outside of the predetermined lower limit, then the WMTS reports to the NMS (Network Management Operating System) the modem ID and the measured data of the particular packet. The NMS may then reassign the modem to a different downstream channel, which has a different operating frequency (useful for fading problems), a lower order modulation type (useful for SNR or multi-path problems), a lower symbol rate (useful for inter-symbol interference), implement a more robust FEC scheme, or some combination of these modifications.

In the downstream, each modem determines an SNR or BER (or some other measurable parameter) measurement for the incoming packets. These values may be compared to some boundary conditions (i.e. some predefined hysteresis window), which may be stored in a table. If the system is performing outside the boundary conditions, the modem sends an exception message to the NMS which reassigns the modem to a different downstream channel or modifies the channel parameters.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will be readily understood by the following detailed description in conjunction with the accompanying drawings, wherein like reference numerals designate like structural elements, and in which:

FIG. 1 is a summary table showing various modulation types and symbol rates for different upstream channels in a wireless modem system;

FIG. 2 is a table showing various bandwidth/modulation trade-offs;

FIG. 3 is a summary table showing various modulation types and symbol rates for different downstream channels in a wireless modem system;

FIG. 4 is a flowchart of an embodiment of the downstream processing according to the present invention; and

FIG. 5 is a flowchart of an embodiment of the upstream processing according to the present invention.

DETAILED DESCRIPTION OF THE INVENTION

The following description is provided to enable any person skilled in the art to make and use the invention and sets forth the best modes contemplated by the inventor for carrying out the invention. Various modifications, however, will remain readily apparent to those skilled in the art, since the basic principles of the present invention have been defined herein specifically to provide a method and system for distributed processing for optimal quality of service in a broadband access system. Any and all such modifications, equivalents and alternatives are intended to fall within the spirit and scope of the present invention.

In general, the present invention relates to the DOCSIS 1.0 (Data Over Cable Service Interface Specification) and DOCSIS 1.1 specifications promulgated by Cable Labs, the disclosures of which are herein incorporated by reference. Whereas the DOCSIS standards only address data over cable, the present invention also applies to wireless data transmission.

In a typical broadband access system, several parameters can be independently modified for both the upstream or downstream signals. These parameters include the modulation type, the symbol rate, the channel or sub-channel frequency, and the forward error correction (FEC) scheme and/or level of robustness. In practice, most system operators set these parameters for a perceived worst case scenario, and never bother to later modify the settings.

In general, the present invention distributes the QOS processing to the system modems and the head-end equipment. Requests for a change in the operating parameters are transmitted on an exception basis, thereby greatly reducing the amount of system over-head required.

Referring now to FIG. 5, in the upstream, the Cable Modem Termination System (CMTS) or Wireless Modem Termination System (WMTS or Wireless Hub) determines a signal-to-noise ratio (SNR), a Bit Error Rate (BER), or a Forward Error Correction (FEC) quality measurement, or similar measure, for each received packet (step 50). This information may be discarded if the data is between some predetermined, acceptable operating limits. However, if a measured parameter is outside of the predetermined lower limit for some averaged or weighted averaged for a series of packets (step 51), then the WMTS reports to the NMS (Network Management Operating System) the modem ID and the measured data of the particular packet or average (step 52). The NMS may then reassign the modem to a different downstream channel in the same (or overlapping) sector, which has a different operating frequency (useful for fading problems), a lower order modulation type (useful for SNR or multi-path problems), a lower symbol rate (useful for inter-symbol interference), a more robust FEC scheme, or some combination of these modifications (step 53).

The upstream demodulator may also report an exceptionally good received SNR or similar parameter or average. In this case, the NMS may choose to move the modem to a channel with a higher order modulation, a different type of modulation, a faster symbol rate, or a lower FEC factor, allowing higher data rates on the modem. The NMS may also choose to move the modem to a channel which has similar parameters but less traffic.

The downstream processing will now be described with reference to FIG. 4. In the downstream, each modem determines an SNR and FEC measurement for the incoming packets (step 40). These values may be compared to some boundary conditions (i.e. some predefined hysteresis window), which may be stored in a table (step 41). If a weighted average value is smaller than the lower limit then the modem sends an exception message to the NMS (step 43), which may reassign the modem to a different downstream channel (step 44). In some instances merely changing the frequency will solve the problem. In other cases, changes in the other operating parameters will be required. If the upper limit is exceeded, then the modem sends an exception signal offering to optionally move to a less utilized channel or one with higher net data rates. Since each modem is monitoring its own received downstream signal, the QOS processing is distributed, which greatly reduces the system over-head, as compared to various prior-art polling schemes. Also, to further reduce the over-head, lower boundary conditions could be sent with a high priority, whereas high boundary condition exceptions (i.e. upper limit exceeded) could be sent less frequently, and with a lower priority. The modem exceptions can be logged by the NMS for review by the system operator.

As part of the present dynamic scheme, various sets of predefined conditions may be established. For example, Channel A may operate at 64 QAM, 5 megasymbols, Channel B may operate at 64 QAM, 2 megasymbols, and Channel C may operate at 16 QAM, 5 megasymbols, creating a matrix of possible operating conditions. By changing channels, the operating parameters may be better for a particular modem, but by also changing the frequency, the propagation path may also have different characteristics. Thus, there is an inter-relationship between the frequency or sub-channel and the other operating parameters for a particular channel. Each modem may have a different optimum setting based upon all of the factors. A database of optimal settings can be maintained for each modem, including which settings are best for different times of day, weather conditions, etc. Alternatively, a weighted average could be calculated, giving priority to the most recent settings. The NMS can then use these settings when establishing communication with the modem.

The NMS may periodically review all channel assignments. If the NMS finds one channel or a group of channels that are serving only a few modems, these modems can be consolidated into one of the existing channels. This would free up spectrum for other channels to be created.

FIG. 1 and 3 illustrate different symbol and data rates for various channels. By changing the modulation type or symbol rate, one can get as much as a 20 dB improvement in performance, as shown in FIG. 2. Also, by changing the frequency for a given modem, its performance may also increase.

As described herein, the present invention adds additional functionality to each modem to allow the modem to determine predetermined downstream boundary conditions and report the state of the condition via an exception flag. The standard communication protocol may also need to be updated to support this extra exception field. By distributing the QOS processing, the present invention provides a greater level of system reliability, without significant additional over-head. In addition, the present invention can automatically compensate for poor conditions, and provide user connectivity, even under very poor conditions. Finally, the present invention also allows for system operators to receive system status reports by logging the exceptions. These exception reports can be used to pro-actively perform system maintenance, before a user even knows there is a problem.

Those skilled in the art will appreciate that various adaptations and modifications of the just-described preferred embodiments can be configured without departing from the scope and spirit of the invention. Therefore, it is to be understood that, within the scope of the appended claims, the invention may be practiced other than as specifically described herein.

Citations de brevets
Brevet cité Date de dépôt Date de publication Déposant Titre
US40104654 avr. 19751 mars 1977International Telephone And Telegraph CorporationChannel encoding for distance measurement equipment
US409912111 juin 19764 juil. 1978Communications Satellite CorporationSpatial diversity satellite communications system with error control
US438538419 mai 198124 mai 1983Racal Data Communications Inc.Modem diagnostic and control system
US4777595 *24 mars 198611 oct. 1988Digital Equipment CorporationApparatus for transferring blocks of information from one node to a second node in a computer network
US505202423 mai 199024 sept. 1991Motorola, Inc.Offset frequency multipoint modem and communications network
US527270017 oct. 199121 déc. 1993First Pacific Networks, Inc.Spectrally efficient broadband transmission system
US531155020 oct. 198910 mai 1994Thomson-CsfTransmitter, transmission method and receiver
US537703528 sept. 199327 déc. 1994Hughes Aircraft CompanyWavelength division multiplexed fiber optic link for RF polarization diversity receiver
US54083491 juil. 199218 avr. 1995Hitachi, Ltd.Optical frequency division multiplexing transmission system
US547164525 sept. 199228 nov. 1995MotorolaMethod of allocating channels in multi-rate channel environment
US548154210 nov. 19932 janv. 1996Scientific-Atlanta, Inc.Interactive information services control system
US548156126 oct. 19932 janv. 1996Comsat CorporationFully meshed CDMA network for personal communications terminals
US548709922 sept. 199423 janv. 1996Mitsubishi Denki Kabushiki KaishaPortable telephone having an additional device for making external connections
US55108597 déc. 199423 avr. 1996Information Resources, Inc.Tuned signal detector for use with a radio frequency receiver
US555761228 févr. 199517 sept. 1996Amati Communications CorporationMethod and apparatus for establishing communication in a multi-tone data transmission system
US559040911 mai 199531 déc. 1996Ntt Mobile Communications Network Inc.Transmission power control method and a transmission power control apparatus
US559660417 août 199321 janv. 1997Amati Communications CorporationMulticarrier modulation transmission system with variable delay
US560666412 avr. 199325 févr. 1997Bay Networks, Inc.Apparatus and method for automatically determining the topology of a local area network
US562587421 déc. 199429 avr. 1997Nec CorporationTerminal station which does not cause an interruption of communication on changing of a communication system
US563420625 mai 199527 mai 1997Motorola, Inc.Method and apparatus for estimating a signal fading characteristic
US566664610 avr. 19959 sept. 1997ComtechRadio frequency (RF) converter system with distributed protection switching and method therefor
US572438530 sept. 19943 mars 1998Qualcomm IncorporatedSerial linked interconnect for summation of multiple waveforms on a common channel
US573458931 janv. 199531 mars 1998Bell Atlantic Network Services, Inc.Digital entertainment terminal with channel mapping
US574052510 mai 199614 avr. 1998Motorola, Inc.Method and apparatus for temperature compensation of a reference oscillator in a communication device
US575216122 sept. 199412 mai 1998Nokia Telecommunications OyMethod and apparatus for replacing a failed channel unit of a sectored base station, in a cellular radio system, with an additional channel unit
US579678331 oct. 199518 août 1998Andre Alain TabourianDigital transmission system
US58090904 mars 199615 sept. 1998Glenayre Electronics, Inc.Digital diversity receiver system
US580940631 août 199515 sept. 1998Fujitsu LimitedReceiving apparatus and method for switching between active and standby receivers
US580942729 juil. 199615 sept. 1998Motorola Inc.Apparatus and method for channel acquisition in a communication system
US581882529 nov. 19956 oct. 1998Motorola, Inc.Method and apparatus for assigning communications channels in a cable telephony system
US58316906 déc. 19963 nov. 1998Rca Thomson Licensing CorporationApparatus for formatting a packetized digital datastream suitable for conveying television information
US586245122 janv. 199619 janv. 1999Motorola, Inc.Channel quality management in a cable telephony system
US586752816 janv. 19972 févr. 1999Alcatel Alsthom Compagnie Generale D'electriciteMethod and modem for adaptive allocation of the pilot carrier in a multi-carrier system
US589641417 sept. 199620 avr. 1999Sarnoff CorporationMethod and apparatus for providing control channel communications for an information distribution system
US590355828 juin 199611 mai 1999Motorola, Inc.Method and system for maintaining a guaranteed quality of service in data transfers within a communications system
US59093844 oct. 19961 juin 1999Conexant Systems, Inc.System for dynamically adapting the length of a filter
US5920571 *7 févr. 19976 juil. 1999Lucent Technologies Inc.Frequency channel and time slot assignments in broadband access networks
US593700530 mai 199610 août 1999Fujitsu LimitedError rate measurement apparatus for a mobile radio communications system
US59407435 juin 199717 août 1999Nokia Mobile Phones LimitedPower control of mobile station transmissions during handoff in a cellular system
US59638439 déc. 19965 oct. 1999Adc Telecommunications, Inc.Amplifier switch controller and system
US596387017 sept. 19975 oct. 1999Nortel Networks CorporationProcess for switching between IS-95 forward power control and fast forward power control
US59741061 sept. 199526 oct. 1999Motorola, Inc.Method and apparatus for multirate data communications
US597885528 nov. 19972 nov. 1999Bell Atlantic Network Services, Inc.Downloading applications software through a broadcast channel
US599128620 févr. 199723 nov. 1999Telefonaktiebolaget L M Ericsson (Publ)Support of multiple modulation levels for a cellular packet control channel
US60093104 août 199728 déc. 1999Nec CorporationRadio selective calling receiver using diversity reception
US60350086 oct. 19977 mars 2000Samsung Electronics Co., Ltd.Automatic gain control in direct sequence spread spectrum communication system
US605240830 mai 199718 avr. 2000Aironet Wireless Communications, Inc.Cellular communication system with dynamically modified data transmission parameters
US607283924 juil. 19976 juin 2000Lucent Technologies, Inc.DVB frame synchronization
US60757878 mai 199713 juin 2000Lucent Technologies Inc.Method and apparatus for messaging, signaling, and establishing a data link utilizing multiple modes over a multiple access broadband communications network
US61118878 oct. 199729 août 2000Zenith Electronics CorporationMethod and apparatus for power tuning a terminal of a bi-directional communications system
US611223227 janv. 199829 août 2000Phasecom Ltd.Data communication device for CATV networks
US61285881 oct. 19973 oct. 2000Sony CorporationIntegrated wafer fab time standard (machine tact) database
US614091112 oct. 199931 oct. 20003Com CorporationPower transfer apparatus for concurrently transmitting data and power over data wires
US614135610 nov. 199731 oct. 2000Ameritech CorporationSystem and method for distributing voice and data information over wireless and wireline networks
US61573117 janv. 19995 déc. 2000Berkovich; YossiPortable electro-magnetic radiation sensor warning device
US616044710 févr. 199912 déc. 2000Adc Solitra, Inc.Amplifier having redundancies
US6169728 *8 sept. 19972 janv. 2001Motorola Inc.Apparatus and method for spectrum management in a multipoint communication system
US61729705 mai 19979 janv. 2001The Hong Kong University Of Science And TechnologyLow-complexity antenna diversity receiver
US618522716 mars 20006 févr. 2001Nokia Networks OyMethod and packet radio system for transmitting modulation and signalling information
US61956972 juin 199927 févr. 2001Ac Properties B.V.System, method and article of manufacture for providing a customer interface in a hybrid network
US6650624 *19 mai 200018 nov. 2003Broadcom CorporationCable modem apparatus and method
US6714551 *19 juil. 200030 mars 2004Alvarion Israel (2003) Ltd.Method and apparatus for maintaining a predefined transmission quality in a wireless network for a metropolitan area
US20040160901 *18 févr. 200419 août 2004Raith Alex KristerThermal transmission control of wireless data modem
CA2187141A14 oct. 19964 avr. 1998Richard ValleeModem with remote monitoring capability
EP0021544A125 juin 19807 janv. 1981Staat der Nederlanden (Staatsbedrijf der Posterijen, Telegrafie en Telefonie)System for the remote testing of a modem for a speed of transmission different from the speed of reception
EP0025767A116 sept. 198025 mars 1981Lignes Telegraphiques Et Telephoniques L.T.T.Method and apparatus for automatically testing a digital data transmission system
Citations hors brevets
Référence
1Data Over Cable Interface Specifications, Cable Modem Termination System-Network Side Interface Specification, SP-CMTS-NSII01-960702 (Jul. 2, 1996) pp. i-13.
2Data-Over-Cable Service Interface Specifications, Baseline Privacy Interface Specification, SP-BPI-102-990319 (Mar. 19, 1999) pp. i-88.
3Data-Over-Cable Service Interface Specifications, Baseline Privacy Interface Specification, SP-BPI-102-990731 (Jul. 31, 1999) pp. i-160.
4Data-Over-Cable Service Interface Specifications, Cable Modem to Customer Premise Equipment Interface Specification. SP-CMC1-102-980317 (Mar. 17, 1998) pp. i-40.
5Data-Over-Cable Service Interface Specifications, Operations Support System Interface Specification Radio Frequency Interface, SP-OSSI-RFI-103-990113 (Jan. 13, 1999) pp. i-29.
6Data-Over-Cable Service Interface Specifications, Operations Support System Interface Specification SP-OSSI-102-990113 (Jan. 13, 1999) pp. i-14.
7Data-Over-Cable Service Interface Specifications, Operations Support System Interface Specification SP-OSSIv1.1-103-001220 (Dec. 20, 2000) p. ii.
8Data-Over-Cable Service Interface Specifications, Operations Support System Interface Specification SP-OSSIv1.1-D01-991115 (Nov. 15, 1999) pp. i-81.
9Data-Over-Cable Service Interface Specifications, Radio Frequency Interface Specification, SP-RFI-I04-980724 (Jul. 24, 1998) pp. i-196.
10Data-Over-Cable Service Interface Specifications, Radio Frequency Interface Specification, SP-RFIv1.1-I03-991105 (Nov. 5, 1999) pp. i-366.
11Golestani, S. (1995) "Network Delay Analysis of a Class of Fair Queueing Algorithms", IEEE Journal on Selected Areas in Communication 13(6):1057-1070.
12Stiliadis, D. et al. (1998) "Efficient Fair Queuing Algorithms for Packet-Switched Networks", IEEE/ACM Transactions of Networking 6(2):175-185.
13Stiliadis, D. et al. (1998) "Rate-Proportional Servers: A Design Methodology for Fair Queueing Algorithms", IEEE/ACM Transactions of Networking 6(2):164-174.
Référencé par
Brevet citant Date de dépôt Date de publication Déposant Titre
US7626939 *16 mai 20051 déc. 2009Emc CorporationMethod and apparatus for automated time-based peer-to-peer thresholding
US7929453 *13 sept. 200619 avr. 2011At&T Intellectual Property I, LpMethod and apparatus for presenting quality information in a communication system
US8300654 *18 mars 200830 oct. 2012Bareis Bernard FBroadband multi-drop local network, interface and method for multimedia access
US852123221 août 201227 août 2013At&T Intellectual Property I, L.P.Methods and apparatus to display service quality to a user of a multiple mode communication device
US8731603 *6 janv. 201020 mai 2014Adc Telecommunications, Inc.RF circuit module and panel
US883751430 oct. 201216 sept. 2014Bernard F. BareisBroadband multi-drop local network, interface and method for multimedia access
US934021414 avr. 201417 mai 2016Caterpillar Inc.System for remotely controlling a machine
US20040103442 *27 nov. 200227 mai 2004Eng John W.End of line monitoring of point-to-multipoint network
US20050138106 *24 janv. 200523 juin 2005Musco CorporationApparatus, system, and method for wide area networking through a last mile infrastructure having a different primary purpose and apparatus and method for electronic scoring, score reporting, and broadcasting
US20080062887 *13 sept. 200613 mars 2008Sbc Knowledge Ventures, L.P.Method and apparatus for presenting quality information in a communication system
US20080181211 *31 janv. 200731 juil. 2008Satish ParolkarMethods and apparatus to display service quality to a user of a multiple mode communication device
US20080310436 *18 mars 200818 déc. 2008Bareis Bernard FBroadband multi-drop local network, interface and method for multimedia access
US20100210236 *6 janv. 201019 août 2010Khemakhem M Hamed AnisRf circuit module and panel
Classifications
Classification aux États-Unis370/235, 370/465, 370/252
Classification internationaleH04J3/22, H04J3/14, G08C15/00, G06F11/00, G01R31/08, H04J3/16, H04L1/00, H04L12/26
Classification coopérativeY02B60/31, H04L1/0009, H04L1/0025, H04L1/0027, H04L1/0001, H04L1/0003
Classification européenneH04L1/00A, H04L1/00A5, H04L1/00A1M, H04L1/00A9A, H04L1/00A9C
Événements juridiques
DateCodeÉvénementDescription
11 mai 2001ASAssignment
Owner name: VYYO LTD., ISRAEL
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:WILSON, ERIC K.;REEL/FRAME:011791/0388
Effective date: 20010402
8 oct. 2008ASAssignment
Owner name: GILO VENTURES IL, L.P., CALIFORNIA
Free format text: SECURITY AGREEMENT;ASSIGNOR:VYYO INC.;REEL/FRAME:021648/0536
Effective date: 20080930
Owner name: GILO VENTURES IL, L.P.,CALIFORNIA
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